They are 9.433981 and -9.433981
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The two square roots of 18 are: 4.242641 and -4.242641
The two square roots are +70 and -70 .
+6 and -6 are the square roots of 36.
4x**2-3x-5 quadratic = (-b+sqrt(b**2-4ac))/2a quadratic = (-b-sqrt(b**2-4ac))/2a b**2-4ac>0 --> 2 roots b**2-4ac=0 --> 1 root b**2-4ac<0 --> 0 roots (-3)**2-4(4*-5) 9+80=89 2 roots = (6+89**0.5)/8, (6-89**0.5)/8
+12 and -12